WA Part H9 Water use

The Objective is to reduce water demand by using water efficiently and minimising water wastage.

To reduce potable water demand, a building is to be capable of using potable water efficiently and preventing excessive loss of potable water.

A building must have features that, to the degree necessary, facilitate the efficient use of potable water appropriate to—

1. the geographic location of the building; and
2. the available potable water supply of the building; and
3. the function and use of the building.

A building, including any water holding structure, must have features that, to the degree necessary, prevent excessive loss of potable water appropriate to—

1. the geographic location of the building; and
2. the available potable water supply for the building; and
3. the function and use of the building; and
4. the effects of permanent features such as topography, structures and buildings.

A building must have features that, to the degree necessary, facilitate the efficient use of heated water appropriate to—

1. the geographic location of the building; and
2. the available heated water supply for the building; and
3. the function and use of the building.

(1) Performance RequirementWA H9P1 is satisfied for a building’s water use efficiency by complying with WA H9D2.

(2) Performance RequirementWA H9P2 is satisfied for a building’s water loss prevention by complying with WA H9D3.

(3) Performance RequirementWA H9P3 is satisfied for a building’s heated water use efficiency by complying with WA H9D4.

(1) All tap fittings other than bath outlets and garden taps must be a minimum of 4 stars WELS rated.

(2) All showerheads must be a minimum of 3 stars WELS rated.

(3) All sanitary flushing systems must be a minimum of 4 star WELS rated dual flush.

An outdoor private swimming pool or spa associated with a Class 1 building must be supplied with a cover, blanket or the like that—

1. is deigned to reduce water evaporation; and
2. is accredited under the Smart Approved Watermark Scheme governed by the Australian Water Association, the Irrigation Association of Australia, the Nursery and Garden Industry Australia and the Water Services Association of Australia.

(1) All internal heated water outlets (such as taps, showers and washing machine water supply fittings) must be connected to a heated water system or a recirculating heated water system with pipes installed and insulated in accordance with AS/NZS 3500: Plumbing and Drainage, Part 4 Heated Water Services.

(2) The pipe from the heated water system or recirculating heated water system to the furthest heated water outlet must not be more than 20 m in length or 2 litres of internal volume.